Math Calculators

Free online math calculators — percentages, fractions, ratios, quadratics, geometry, statistics, and more.

Percentage Calculator

Find percentages, percent of a number, and percent change.

Add, subtract, multiply, and divide fractions.

Simplify ratios and scale them proportionally.

Solve ax² + bx + c = 0 and show the discriminant.

Calculate area of rectangles, circles, triangles, and trapezoids.

Calculate volume of cubes, spheres, cylinders, and cones.

Calculate sample or population standard deviation from a dataset.

Find greatest common divisor and least common multiple.